期刊
ADVANCED MATERIALS
卷 31, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201901966
关键词
carrier extraction efficiency; low-dimensional perovskites; perovskite solar cells; ultrafast transient absorption
类别
资金
- Beijing Natural Science Foundation [2194093] Funding Source: Medline
- National Nature Science Foundation of China [91733302, 2015CB932200, 61605073, 51773206, 51573192, 21522308] Funding Source: Medline
- Macau Science and Technology Development Funds [SRG2016-00087-FST, MYRG2018-00148-IAPME, FDCT-116/2016/A3, FDCT-091/2017/A2, FDCT-014/2017/AMJ] Funding Source: Medline
- University of Macau Funding Source: Medline
- K.C. Wong Education Foundation Funding Source: Medline
- National Key R&D Program of China [2016YFB0401100, 2016YFC1100502, 2016YFB0401603, 2018YFA0208501] Funding Source: Medline
Low-dimensional Ruddlesden-Popper (LDRP) perovskites are a current theme in solar energy research as researchers attempt to fabricate stable photovoltaic devices from them. However, poor exciton dissociation and insufficiently fast charge transfer slows the charge extraction in these devices, resulting in inferior performance. 1,4-Butanediamine (BEA)-based low-dimensional perovskites are designed to improve the carrier extraction efficiency in such devices. Structural characterization using single-crystal X-ray diffraction reveals that these layered perovskites are formed by the alternating ordering of diammonium (BEA(2+)) and monoammonium (MA(+)) cations in the interlayer space (B-ACI) with the formula (BEA)(0.5)MA(n)PbnI(3n+1). Compared to the typical LDRP counterparts, these B-ACI perovskites deliver a wider light absorption window and lower exciton binding energies with a more stable layered perovskite structure. Additionally, ultrafast transient absorption indicates that B-ACI perovskites exhibit a narrow distribution of quantum well widths, leading to a barrier-free and balanced carrier transport pathway with enhanced carrier diffusion (electron and hole) length over 350 nm. A perovskite solar cell incorporating BEA ligands achieves record efficiencies of 14.86% for (BEA)(0.5)MA(3)Pb(3)I(10) and 17.39% for (BEA)(0.5)Cs-0.15(FA(0.83)MA(0.17))(2.85)Pb-3(I0.83Br0.17)(10) without hysteresis. Furthermore, the triple cations B-ACI devices can retain over 90% of their initial power conversion efficiency when stored under ambient atmospheric conditions for 2400 h and show no significant degradation under constant illumination for over 500 h.
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